I actually believe its a good thing to leave "a little copper" to smooth the rough spots. The best thing I've found to remove copper is Bore Tech Eliminator and it will not hurt your barrel if you leave it in overnight! A few swipes with IOSSO helps polish up the rough spots after you get the copper out. I usually finish everything off by running a couple of patches with Kroil and it's ready to shoot. The Kroil will help to prevent dry fouling on your first shot.....RichIf it's Shooter's Choice copper remover it has a strong ammonia base and if not used properly can etch your barrel. IMHO I prefer using a nylon brush and don't think every trace of copper must be removed.
Good grief! Don't DO that! You will beat up the throat, the crown, and about everyplace inbetween. You can destroy the accuracy in a barrel cleaning it faster than about any other way.I just noticed today while cleaning one of my guns that the barrel was warm and did not really pay it any mind but as I kept going it got very hot just from rubbing the patches back and forth through the barrel
+100!!!!!Good grief! Don't DO that! You will beat up the throat, the crown, and about everyplace inbetween. You can destroy the accuracy in a barrel cleaning it faster than about any other way.
Highly recommended you immediately go to the 6mmBR.com web site and read the article about cleaning rifle bores before you even touch another cleaning rod.
Bore Cleaning Method